M-CSF potently augments RANKL-induced resorption activation in mature human osteoclasts

• Published in: PloS one 2011-06, Vol.6 (6), p.e21462-e21462
• Main Authors: Hodge, Jason M, Collier, Fiona M, Pavlos, Nathan J, Kirkland, Mark A, Nicholson, Geoffrey C
• Format: Article
• Language: English
• Subjects: Actin; Actins - metabolism; Amino acids; Augmentation; Biocompatibility; Biology; Biomedical research; Blotting, Western; Bone resorption; c-Fos protein; Cell activation; Cell survival; Cells, Cultured; Chemokines; Enzyme inhibitors; Extracellular signal-regulated kinase; Genotype & phenotype; Humans; Kinases; Leukocytes (granulocytic); Macrophage colony stimulating factor; Macrophage Colony-Stimulating Factor - pharmacology; Macrophages; MAP kinase; Medicine; Mitogen-Activated Protein Kinase 1 - metabolism; Mitogen-Activated Protein Kinase 3 - metabolism; Mitogens; Motility; Muscle proteins; NF-kappa B - metabolism; NF-κB protein; NFATC Transcription Factors - metabolism; Osteoclastogenesis; Osteoclasts; Osteoclasts - drug effects; Osteoclasts - metabolism; Penicillin; Phosphorylation; Pits; Polyclonal antibodies; Protein kinase; Protein kinases; Proto-Oncogene Proteins c-fos - metabolism; RANK Ligand - pharmacology; Stimulation; Survival; TRANCE protein; Transcription factors; Umbilical cord
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0021462

Macrophage-CSF (M-CSF) is critical for osteoclast (OC) differentiation and is reported to enhance mature OC survival and motility. However, its role in the regulation of bone resorption, the main function of OCs, has not been well characterised. To address this we analysed short-term cultures of fully differentiated OCs derived from human colony forming unit-granulocyte macrophages (CFU-GM). When cultured on dentine, OC survival was enhanced by M-CSF but more effectively by receptor activator of NFκB ligand (RANKL). Resorption was entirely dependent on the presence of RANKL. Co-treatment with M-CSF augmented RANKL-induced resorption in a concentration-dependent manner with a (200-300%) stimulation at 25 ng/mL, an effect observed within 4-6 h. M-CSF co-treatment also increased number of resorption pits and F-actin sealing zones, but not the number of OCs or pit size, indicating stimulation of the proportion of OCs activated. M-CSF facilitated RANKL-induced activation of c-fos and extracellular signal-regulated kinase (ERK) 1/2 phosphorylation, but not NFκB nor nuclear factor of activated T-cells, cytoplasmic-1 (NFATc1). The mitogen-activated protein kinase kinase (MEK) 1 inhibitor PD98059 partially blocked augmentation of resorption by M-CSF. Our results reveal a previously unidentified role of M-CSF as a potent stimulator of mature OC resorbing activity, possibly mediated via ERK upstream of c-fos.